Etymology
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adios (interj.)

1837, American English, from Spanish adios, from phrase a dios vos acomiendo "I commend you to God;" the French form is adieu (q.v.).

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Definitions of adios

adios (n.)
a farewell remark;
Synonyms: adieu / arrivederci / auf wiedersehen / au revoir / bye / bye-bye / cheerio / good-by / goodby / good-bye / goodbye / good day / sayonara / so long
From wordnet.princeton.edu